C# - Cannot implicitly convert type List to List

Question

I have a project with all my Interface definitions: RivWorks.Interfaces
I have a project where I define concrete implmentations: RivWorks.DTO

I\'ve done this hu

Answer 1

Yep it's a covariance limitation in C#. You can't convert a list of one type to a list of another.

Instead of:

List myList = new List();

You have to do this

List myList = new List();

myList.Add(new dto.Product());

Eric Lippert explains why they implemented it this way: http://blogs.msdn.com/ericlippert/archive/tags/Covariance+and+Contravariance/default.aspx

(And why it is different than working with arrays of items).